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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da95d023f42d71aa3390166ea5e5fdd3d529896daa309ff5b65acec1b58d0061' 
  AND token = '65bo737Jj1pwMKaYyyCpkvYl2pu3N26T9bx0VeqidH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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