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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6311c555dee6b72098799f7586cd8ca856f61af6aec386da79c7b0b7d4171e98' 
  AND token = 'j7WxmJVNmJRQ2Q9T7i+1dMp9cLVBj7vEhhO6mE3WCVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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