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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07260c1b491d8582020d2d8917234c158f6844372d7ea5b92ac9cc45c3b06e43' 
  AND token = 'cnDoDCcCd/NnNvHm0N8KVL5dSN8GSJPeWrHDUFEaFk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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