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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42409d4f5a509eeaf71acf2118e8e3e6f6944d40e1ea9227d4b1bb583ed68aff' 
  AND token = 'zq1BAfOB0AABzbbwlj8pncaqV+chl99KYGvNGbdnYdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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