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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e7e1ddf0de668fb3783318bcaf61f47876afc23301f8277575107c0371baa28' 
  AND token = 'R3NICGzu7owF3//0M2r+8yiaU73ZsWDQQYqhEQ/09QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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