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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0b072ab044c2d8f354cdca0bd564afdb2d6a5d02c0a813081d549db4e0b6f3b' 
  AND token = 'UKR9WO76df+K8R3NYByI+Goauxzb21iK8aID9V2PYVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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