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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '667cdd1da1dcfbb1dd823bab7247e85740bdd1dc75b6fb9fee45c6878bfc2edf' 
  AND token = 'heB8qzVmSlDge+qPMxnzxc9h0e3FWuql2SBTpXQcVI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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