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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a79c98116050865b8d07dcfa6a571361a8915f133153da1325ca8000ab883d70' 
  AND token = 'hytayC2zW0Fl4kdoxOJDsMnyY/Zk+z9g28xUeLXTcfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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