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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '517ae009cd9c085ae86929bbad746a9667a4ce7614095b14d575e796c0c801c4' 
  AND token = 'wsq/MRZP1jBvZugOhHpd4jrc03dkj1dzopiKDGd8MeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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