SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d4b8e616a6b34ee7dc9faf9dcc93279052bba22511314d42808b9cabb16777f' 
  AND token = 'ZFJJgrRphmKYXZ9lKmRz3YPfWB+xDMTBGf93X9Z9UXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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