SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bfa1d676214fcb94dd655930507cacd1c1be7d9576971f31202a9d361e2811e' 
  AND token = 'BJ3sDAmXphqrPjDHoSyrwP+nmt3D01QuKvXjApsmkYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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