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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b8b0a0298b72f897d5c94746f40003de519d10c03fdc4118f2276bd0b0c998f' 
  AND token = 'ArTTYFy3sHffhtQM0ztkBsk8W6ToO5qAxxPrkQXIYgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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