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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05cf65f44c6e180c855e9f7679e559e2cfd33441ba256d42b2a053ff6f7eaa02' 
  AND token = 'orPviaPamUEU0smtaG2pwhBtZCtUjFpDbFjIM9R81hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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