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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c848cc65f455b42631e4ead7974fe913b44cfe76f2133ce8587e7346b1b6239c' 
  AND token = '3XZ6QvUCAcfanrS9m5cyT5H5b13Fb+0qeksUeGwm3YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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