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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad57983ef48c564d0821f7c84252eecae23b7a6fae9399d9e25b0e7274202cc3' 
  AND token = 'QiHPzxiyePYA16I4VaEGYxpPEwMJiYz6E5nHDsspNTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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