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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '627a70bdbcbd6c2770c85d01fbceda96d08762ef4fbdfb5dd76ae6d5dde2d926' 
  AND token = 'GDX49eOPCWnqLNSrqIGbTSS71cbGuqoO71DD4GPAWKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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