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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b6f82ac883e87b0c1a1d3a568a629c28d7172d653f308dd15e621378227c26f' 
  AND token = 'E2+M5wR2v0LrZQBUK9sEQE5W0oNH5IPaKfxDoHEPj5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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