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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f6a9e96efbe80a3de6951ac2012629892d981cf6dfe05361a1527670498dc8e' 
  AND token = 'POn5fEx7RtbRZKMEon5e+Q3eV9pcmfJffeIaq2SJHxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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