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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be66b282c7892bf8ca6fbf831e71233d9a142905e69ac7d69f4af1bb2de2cef4' 
  AND token = 'kzQJN+Dorffvz6CwAb/tRHT8U7dI6los0b8LqO0v4mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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