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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02cec57343debe5eae7fe44f295c4d0cee7a0d05cae78386f302089268ed8fe5' 
  AND token = 'He14Kkmhz8N8QbiPp5ok+DJ5avyzHXEm1GxIJzCaIpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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