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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8308969dfa70f8a9976b78340b36b12331175c0c7107f5e128f0b3d30dbd5808' 
  AND token = 'gtmu1KA0ptxcE4eWOkkkZNZ03r/kQGKihQvbhNVTpdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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