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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c38bef8272d3a091cbd1a93387ead4e1fb11fc769517a0eb4013a9c6dd04914' 
  AND token = 'Zb7eYEjN9RFgELDp2Y4C9iyPiIfxiEhiQZHeL5SClzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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