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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7568d3d7715d8fd87edb96be7c76402aea44708520ad324e3d74b4c00642990c' 
  AND token = 'XB6iHV6rdmWMNio4Fmfd80o2OM8NT0W0UjUYuDCYpaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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