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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0ac4f7d46676708a402e419bb9c543c01041ff5f577d495b0bbd9e71d79dc4e' 
  AND token = 'NgbmXcVq2zkCRD4x7gdvnLd6LzwEg170zdPrckV8dZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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