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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1c11318207486c0eac7394693be697603e78920820c2ad946aaddaec4c8dbc3' 
  AND token = 'Srs9+04lWB/zY4JOAEhmFkCJ5InkxrNUgxDG+LS4iMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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