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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f5af6765c61345d425c5b8a643c1f2e93a384395d96dcac67d447ff91aa3a03' 
  AND token = 'WugAHq27pzWzmSIj7E0nMp7fAHQU1EFSvgG8DnktniY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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