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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb6eea72436e629d2dd0b4612954fca5c66b0bda825ce5b8ef58c83f779b7a92' 
  AND token = 'xmdO8xKjAOxvyaweH1EiMFFvU5vdtwPCe2Iqa0BqCa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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