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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd56e7e2f8ba511c296c9ea51bdcfeb3a80ade2797e7aaa00d58b2a205a57cdd2' 
  AND token = 'XweWzho73ChvpLjXtS4hNW+38GhZ/+gIpvfHBXdtENQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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