SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f1fef2ce6367b66444521a1ef04b9d7694f8f5bddbcb3bbb88af0809622984e' 
  AND token = 'ZISUSHlH3ozvo+atT0nEdQw8Sv68q6FYLYi4z/G+6dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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