SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3e731ea08b2bf85d4c3cac9973af5e966424d51e2744211ae50807f9c069bcf' 
  AND token = 'jKmMOm6R1uWzTYBMBQZBhlu4q9QW/tQV723lBO7ECNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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