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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51798d6d4dca27e30216884780e0d6032619deafad295ef426ceb68f81a1234c' 
  AND token = 'AMUMfGhKA/3DErjXrKHURjNmF9pG7hmP5Z3H3u22daI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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