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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e794f0b8982e415ceb4a8cc2b433f6994ec52f2b30331edc002ad69f1ab6f1a8' 
  AND token = 'hawVJyoxE9NWCyXx5ysGKR4xwdlofSkzCRL7pWRQlYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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