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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ba8e1b116f21b63bffb5a5f90c32f6be407f61620a26a40283fd68a465e1819' 
  AND token = 'Xay/UO6+j4cQTlBHZCUnsRMJoDU8a2ljoTOCjJltR5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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