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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6756ab9e0d3c4bc2e449ccca750a7949562f7d34767a9aa9020838ad36b48d27' 
  AND token = 'fNLvUGTcS3gQkt9EvovZKnNXV0mS2eXPURZQtT0wk/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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