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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1658662f5057bccbc80a903aebeaa839a3c9c1d4b2a9d0b9cfa903baae374a50' 
  AND token = 'lJa/8kLWlPGvmPO7b1xCa5DBSLNR+NLitGdi/zDcb2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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