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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '025f73b2e4f7cdab4147e29f95ca93684c79078b8b40b8ded368ad09451485df' 
  AND token = 'tfXC++12HRItEJL0YOBaiqs20P5Jn7RHblY2i2ky78Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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