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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd04ae1c64f4959b7434be10b2cc96e72e5b029d2e6ce16a3f8dbc4c3b78e4576' 
  AND token = 'yKSg/1kVA5pESHVlJ6bFgbs/2Bi2pU8u+vEd7cq23pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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