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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32d8defc22dc4c30c9601dab5987f882dca507fc1cdb1ba828a8097389b4d9c5' 
  AND token = '4qxdx7+1TZyn7SdrwS5Gn9wIRUeIYoIWrfjxGaKzKxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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