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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3464bc9211e7091a2da21449b1b3008085aa6b4b72ac33da7c6b6ce1666a7c28' 
  AND token = '3mNLVTpWHwov1d4PUan0KuP5H1nVNOv96JJMmkiOZR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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