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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4fd1da9ecb33493accedccc30135607d7f7be31493ceb42f9bf0eea5dc9d980' 
  AND token = 'Ucf7/+/4o0j6/kJPofW2k/dkbuswbTYihNrStt5PKAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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