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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dcd97c36a79af2af152649b32ee9a853b843e51ff240dfa7c9c662301944061' 
  AND token = 'Xcm4spJ6JG+yL0wR6xyXovCxmc4PqFbroq25bvsrRyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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