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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d1b872f197b3a9aec83481a52bc0f73dea574ce19803494e300f88729be0ddb' 
  AND token = 'B4AQVOtUhhF0r6E7fxK3hqwWo63YATmpgNOFf7HxPgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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