SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ce13ffd1b20b937c5371f167996032508c4843cd3a7c4557303b0e6e0af1134' 
  AND token = 'ckGCDEoISpqAkH6+ZJhH4g6mUlcEgobL+KDmC3pOMYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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