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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e04e1f6da99baa0424aa02ef79eee1138e0a3cd9acec6a8f1bcdfdd5d174738' 
  AND token = '+IyD2+IGCsfqFvSg7a7GmuAITFHrAaUiCsrz2oIz3H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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