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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a825982a1c0b882ec17993fea7a47e5e69363e936916357d37d15558d6431d4' 
  AND token = 'BHXpFgvWONvVOyQ3enaFWR/7v5mzGSqjRlT0DWO0o0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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