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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea8ed7f90c61b2616046dd92e0090eac8b0bef1d3dc35222c0e397a15352e59d' 
  AND token = 'g2mNX7ZEnuM18m5lGR7Xs6C9KM6vd05mbAYZrzYw+0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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