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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d11e4bc4e5118750f3198744fbf5e4117fcd06e8a6dd9143f5ccd1c5838464a' 
  AND token = 'WH2W0XiM5kuCUA6mwLE3mMIyS3zCxFb0zQriJsqXPx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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