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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3807f88ac4b6758d419dd2f7eb07d21f51ccb09d805e1e7d82bc4af9119b5de0' 
  AND token = 'Dl2OfemMlvchct+5P/V+yUTHL7CD8ZAk3KzJn8kwrA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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