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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b2deecc519c2f27c62331034983f30e2852ad209ba4c9dddf80c02f4a9c8162' 
  AND token = 'HJMKyExHn48Jev5oGOtz+MVrrJp3WLbfeUu1tpYiEik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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