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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9be6ff2c7b9becf2c581281a0dd7a0dfa2908cb32cd4cbb331b97a30609e553f' 
  AND token = 'dEVZySM/AU4rIOusT/0b8HGcSEMtIsYT1IT+shTbS8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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