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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30023b58cc95a454ab2231e15123c25e224c57f12fc504a415c3669d6466591b' 
  AND token = 'orkXqiy4CNJbg+TEmgPC5TX6PEA2qv9MDobImHOc9iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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