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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71207779ce2f4499c8dd5ac44eb5eda3582ef99f12e5debf188140c3314e7091' 
  AND token = 'R+0Z2cp6RCgS87dmFTsCiw6WICSxA8BVKS0RUVz6JRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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