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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '795caa0941c9c32018c3c761acb73516fefb4276fb9226496e8ea6c46da48165' 
  AND token = 'woLfO6CG6Qf53bryUz16+VP9Cv3ikJXB0LmOd3WxtJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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