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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85be971745008176945365947f832968140e0cf62166831b516b786860c868b0' 
  AND token = 'R5YwRH+BlfkOQN9Wr4y4QGKgkgeJd1N+8k+k13pfO1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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