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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7412687239cd1378ae2be68814167ff963f307e96c97aea7b85846c8debe258' 
  AND token = 'AHe+gHGdtfQOt1u4nu5o5qdzxuYR/DfbC9kCxGsogoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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