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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71231f9f321ec1f6d8b79c6c1acb1a514f81aa835b7047ffbdfed065d9a87aab' 
  AND token = 'nT7/KyiueMaatq7n9hjqgVDyQ79c+5qqFNoQNKfqf5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}